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Derivatives (Details)
£ in Billions
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 20, 2018
GBP (£)
Jan. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2019
EUR (€)
Derivative [Line Items]            
Purchase consideration (GBP)       $ 5,927,000,000 $ 1,040,000,000.00  
Decrease in net investment hedges       28,000,000    
FX Contract            
Derivative [Line Items]            
Gain on derivative       31,000,000    
Unrealized loss         325,000,000  
Treasury Lock            
Derivative [Line Items]            
Charge to settle derivative contract   $ 122,000,000 $ 6,000,000      
JLT Transaction            
Derivative [Line Items]            
Purchase consideration (GBP) £ 5.2     5,568,000,000    
JLT Transaction | FX Contract            
Derivative [Line Items]            
Loss due to change in fair value of derivative       26,000,000    
JLT Transaction | Treasury Lock            
Derivative [Line Items]            
Unrealized loss         116,000,000  
Derivative hedge, asset       2,000,000,000 $ 2,000,000,000  
Senior Notes            
Derivative [Line Items]            
Debt instrument, face amount   $ 5,000,000,000        
Senior Notes | JLT Transaction            
Derivative [Line Items]            
Debt instrument, face amount | €           € 1,100,000,000
Charge to settle derivative contract       $ 7,300,000    
Net investment hedge, threshold percentage of the equity balance       80.00%